1. Doctoral Program of Medical Science, Faculty of Medicine, Universitas Airlangga, Surabaya, INDONESIA
2. National Brain Center Hospital, Jakarta, INDONESIA
3. Department of Public Health, University of Indonesia, Jakarta, INDONESIA
4. Gastroentero-Hepatology Division, Department of Internal Medicine, Faculty of Medicine, Dr. Soetomo Teaching Hospital, Airlangga University, Surabaya, INDONESIA
5. Helicobacter pylori and Microbiota Study Group, Institute Tropical Disease, Universitas Airlangga, Surabaya, INDONESIA